In exercising the above-mentioned powers, the Board may reverse or affirm, wholly or in part, or may modify the order, requirement, decision or determination appealed from, and may make such order, requirement, decision or determination as sought to be made and, to that end, shall have all the powers of the officer from whom the appeal is taken. Notice of the Board's decision shall forthwith be mailed to the applicant, the property owner and other interested parties.